<!--  -->
<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <!-- logo图片区域 -->
        <img src="../assets/logo1.png" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>

    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠按钮 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <!-- unique-opened 是否只保持一个子菜单的展开 :default-active="activePath"-->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模版区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <!-- index 确定点击的路径 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id" @click="saveNavState('/' + subItem.path)"
            >
              <!-- 二级菜单的模版区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>

      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      // 定义一个字体图像对象
      iconsObj: {
        // 根据一级菜单的 id 对应一个字体图标
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠菜单
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    };
  },
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods: {
    // 退出功能
    logout() {
      window.sessionStorage.clear();
      this.$router.push('/login');
    },
    // 获取所有的菜单
    getMenuList() {
      this.$http.get('menus').then(res => {
        // console.log(res);
        const data = res.data;
        if (data.meta.status !== 200) {
          return this.$message.error('data.meta.msg');
        }
        this.menuList = data.data;
      });
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }
  }
};
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu {
    // 把边框线去掉
    border-right: none;
  }
  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    text-align: center;
    color: #fff;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
}

.el-main {
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 10px;
}
</style>
